With my extensive understanding and operative knowledge of SMTP servers, particularly the Exim software that your server is based on, I am confident in my ability to diagnose and resolve the issue crippling your email system. Having worked extensively in self-hosted email service environments, I am no stranger to troubleshooting, especially when it comes to deciphering complex server logs and error messages. Restoring smooth functionality to your email service will be my top priority.
Furthermore, spanning across various Linux distributions such as Ubuntu, CentOS, Kali Linux, Debian, and Rocky Linux, I bring a diverse range of skills that allows me to adapt and work effectively within any server environment. On top of this, my competence with DNS management factors in seamlessly to mitigate other potential issues that may arise during the course of fixing the SMTP.
Lastly, as a full-stack developer proficient in ReactJS and NodeJS for web development,I understand the critical importance of maintaining an efficient and reliable email communication system. Trust me to not only solve this problem but also enhance your infrastructure so you can mitigate the likelihood of such outages in the future. Let's ensure your email system is firmly back on track together!